In 1995, journalist Dava Sobel's Longitude caused an earthquake in the history of science community. The present article analyses how only recently historians of science have fully realized the novelty the book represented. In the meantime, the international success of popular books by journalists on the history of science has become a well-known phenomenon. The author suggests that the huge publishing success of Sobel's book ­ the "Sobel Effect" ­ has provoked three main kinds of reaction among historians: rejection, detachment, and imitation. Which of the three strategies is the best, for both public and authors?

Nowadays, India is experiencing a widespread diffusion of science communication activities. Public institutions, non-governmental organisations and a number of associations are busy spreading scientific knowledge not only via traditional media but also through specific forms of interaction with a varied public. This report aims to provide a historical overview of the diffusion of science communication in India, illustrating its current development and its future prospects.

Many lives could have been saved on 26 December 2004, when the tsunami unleashed by an earthquake of magnitude 9.0 off the coast of the Indonesian island Sumatra struck a dozen coastal villages along the Indian Ocean. Those lives could have been saved if, on that day, science communication had not resulted in a complete failure to communicate scientific information adequately in many cases, in different places and at different levels. A long time passed between the violent shock and the devastation caused by the tsunami waves ­ in most cases, many hours.

Internal scientific communication and public communication of science and technology are growing in Brazil at a good pace, along with scientific productivity. In this Focus we will try to analyze the debate on standard or alternative models of communication of science that can be seen in the practice of science journalism and popular science in Brazil.

Contemporary radio is under-studied by academic researchers, while on the contrary it expresses great exigencies of knowledge. Media studies examined deeply radio when it was the mainstream medium, i.e. in the Thirties, especially in the US also for marketing needs of a largely commercial broadcasting system.